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mutation-testing-advisor

Analyzes test suites to identify surviving mutants, weak assertions, and false confidence in line coverage.

skills/testing/mutation-testing-advisor/SKILL.md

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## Purpose

Evaluate the true fault-detection capability of a test suite by simulating code mutations (inverting conditionals, altering arithmetic, removing function calls) and highlighting tests that pass despite broken logic.

## When to Use

- A codebase has 90%+ line coverage but bugs still regularly slip into production.
- Reviewing unit tests that assert on execution without verifying state changes.
- Setting up Stryker or Mutmut mutation testing in critical packages.

## What to Analyze

1. **Mutant Categories**:
   - Conditional Boundary Mutations (`>` swapped for `>=`).